I put mine in from Retro, but the 35w. Glad I didn't get the 55's ,as the 35's are WAY bright.I can't imagine going brighter. They light up the highway signs, like seeing HD TV on a new flat screen compared to a 20yr old set. The "drunk bumps" light up like airport landing lights. Very happy with them, customer service is excellent!Like AZ Snake said, takes about 30min,even on the new Mustangs.If you're going to the pancake breakfast this Sunday, I'll show you the set up on mine.